<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>键盘事件</title>
    <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
    
</head>
<body>
    <input type="text">
    <h5>表单元素</h5>
    <div id="demo"></div>
    <form name="loginform" id="loginform" method="post">
        <div>   
          <p>用户名：<input type="text" name="username" class="name"/></p>
          <p>手机号：<input type="text" name="phone" class="phone"/></p>
          <p>密码：<input type="password" name="password" class="pwd"/></p>
          <p><input type="button" class="log_btn" value="登陆"/></p>
        </div>
    </form>
    <button class="print">不准打印</button>
    <button class="lunxun">停止轮询</button>

    <h2>杨浦</h2>
    <input type="text" class="yp">
    <button class="btn">按钮</button>
</body>
<script src="js/index.js"></script>
</html>